CN103516287A - Calculating method and calculating device - Google Patents
Calculating method and calculating device Download PDFInfo
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- CN103516287A CN103516287A CN201210203560.8A CN201210203560A CN103516287A CN 103516287 A CN103516287 A CN 103516287A CN 201210203560 A CN201210203560 A CN 201210203560A CN 103516287 A CN103516287 A CN 103516287A
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Abstract
The invention relates to a calculating method and calculating device. The calculating device comprises: a communication module for obtaining a motor temperature, a stator current and a rotor rotating speed of a pump from the pump which is used for supplying reducing agent for treating tail gases to a vehicle; a measurement module for determining work efficiency of the motor according to the obtained temperature and the stator current as well as a stator voltage of the motor; and a calculating module for calculating hydraulic pressure of the pump according to the determined work efficiency, the obtained stator current and the rotor rotating speed as well as the stator voltage of the motor. By utilizing the calculating method and calculating device, tail gas treatment cost of the vehicle can be reduced without using a pressure sensor for measuring the hydraulic pressure of the pump.
Description
Technical field
The present invention relates to a kind of computational methods and calculation element.
Background technology
In order to reduce the pollution of Vehicular exhaust to atmosphere, vehicle is provided with exhaust gas processing device conventionally in blast pipe, and it utilizes automobile-used urea (for example adBlue, AUS32) as reducing agent, to process the tail gas of the engine discharge of vehicle conventionally.
Exhaust gas processing device comprises that it has the pump housing and motor for supply with the reducing agent supply pump of automobile-used urea to the blast pipe of vehicle.Wherein, motor is for driving the pump housing to supply with automobile-used urea to the blast pipe of vehicle.
The tail gas of discharging in order to ensure vehicle meets environmental regulations, the automobile-used urea that reducing agent supply pump is supplied with to the blast pipe of vehicle need to maintain in the vehicle urea dosage range of expectation, and this can realize by controlling the spinner velocity of the motor in reducing agent supply pump.
Vehicle comprises urea-spray control unit (DCU:Dosing Control Unit), it includes pump pressure and controls (PPC:Pump Pressure Control) module, be used for according to the hydraulic pressure of reducing agent supply pump, passing ratio integral differential (PID:Proportional-Integral-Differential) is controlled the setting spinner velocity calculate the motor in reducing agent supply pump, to maintain the automobile-used urea supplied with to the blast pipe of vehicle in the vehicle urea dosage range of expectation.
At present, on vehicle, be equipped with the hydraulic pressure that special pressure transducer is measured reducing agent supply pump, to offer DCU, calculate the setting spinner velocity of the motor in reducing agent supply pump.
Yet, utilize special pressure transducer to measure the hydraulic pressure of reducing agent supply pump, increased the cost that Vehicular exhaust is processed.
Summary of the invention
Consider the problems referred to above of prior art, the embodiment of the present invention provides a kind of computational methods and calculation element, and it can reduce the cost that Vehicular exhaust is processed.
A kind of computational methods according to the embodiment of the present invention, comprise step: from for obtain temperature, stator current and the rotor speed of described pump motor for the treatment of the pump of the reducing agent of tail gas to vehicle supply; According to the stator voltage of obtained temperature and stator current and described motor, determine the operating efficiency of described motor; And, according to the stator voltage of determined operating efficiency, the stator current obtaining and rotor speed and described motor, calculate the hydraulic pressure of described pump.
A kind of calculation element according to the embodiment of the present invention, comprising: communication module, for from for obtain temperature, stator current and the rotor speed of described pump motor for the treatment of the pump of the reducing agent of tail gas to vehicle supply; Measurement module, for according to the stator voltage of obtained temperature and stator current and described motor, determines the operating efficiency of described motor; And computing module, for according to the stator voltage of determined operating efficiency, the stator current obtaining and rotor speed and described motor, calculates the hydraulic pressure of described pump.
From description above, can find out, the present invention determines the hydraulic pressure of this pump according to the parameter of the motor of the pump for to vehicle supply reducing agent, therefore, with utilize pressure sensor to obtain for the prior art of the hydraulic pressure of the pump to vehicle supply reducing agent to compare, the present invention has reduced the cost that Vehicular exhaust is processed.
Accompanying drawing explanation
Other feature of the present invention, feature, benefit and advantage will become more apparent by the detailed description below in conjunction with accompanying drawing.Wherein:
Figure 1A-1C shows according to the structural representation of the reducing agent supply pump of one embodiment of the invention;
Fig. 2 shows according to the communication scheme of the urea-spray control unit of one embodiment of the invention and reducing agent supply pump;
Fig. 3 shows according to the schematic flow sheet of the computational methods of one embodiment of the invention; And
Fig. 4 shows according to the schematic diagram of the calculation element of one embodiment of the invention.
Embodiment
The technical scheme that the embodiment of the present invention provides utilizes the parameter of the motor in the reducing agent supply pump of exhaust gas processing device to determine the hydraulic pressure of reducing agent supply pump, thereby the in the situation that of working pressure transducer not, just can obtain the hydraulic pressure of reducing agent supply pump, reduce the cost that Vehicular exhaust is processed.
Below, in connection with accompanying drawing, describe each embodiment of the present invention in detail.
Figure 1A-1C shows according to the structural representation of the reducing agent supply pump of one embodiment of the invention.Wherein, Figure 1A is the front view of reducing agent supply pump, and Figure 1B is the left view of reducing agent supply pump, and Fig. 1 C is the decomposing schematic representation of reducing agent supply pump.
As shown in Figure 1 C, reducing agent supply pump 10 comprises motor 12.Wherein, motor 12 comprises motor stator 14 and the motor rotor 16 with circuit board.Wherein, the circuit board in motor stator 14 can be measured also temperature, stator current and the rotor speed of output motor 12.In addition, the circuit board in motor stator 14 can also receive from outside the setting rotor speed of motor 12, and controls motor rotor 16 and rotate according to received setting rotor speed.
In addition, reducing agent supply pump 10 also comprises eccentric wheel 18, and it rotates together with motor rotor 16.
In addition, reducing agent supply pump 10 also comprises the bearing of the crank pin 20 being enclosed within on eccentric wheel 18.Wherein, when eccentric wheel 18 rotates, bearing of the crank pin 20 moves up and down.
In addition, reducing agent supply pump 10 also comprises the connecting rod 22 being enclosed within on bearing of the crank pin 20, and it moves up and down along with moving up and down of bearing of the crank pin 20.
In addition, reducing agent supply pump 10 also comprises the working diaphragm 24 being connected with connecting rod 22, and along with moving up and down of connecting rod 22, the inner chamber at the pump housing moves up and down for it, injection of reducing agent is mapped to the blast pipe of vehicle.
Inventor in the situation that the reducing agent supply pump 10 shown in Figure 1A-1C is carried out to lot of experiments, finds following rule.
Wherein, input power, stator voltage and the stator current of the motor 12 of reducing agent supply pump 10 meet following equation (1).
P
in=U×I （1）
Wherein, P
inbe the input power of motor 12, U is the stator voltage of motor 12, and I is the stator current of motor 12.
In addition, the hydraulic torque of the working diaphragm 24 in the power output of the motor 12 of reducing agent supply pump 10 and rotor speed and motor 12 meets following equation (2).
P
out=M
t×2π×n/60 （2）
Wherein, P
outthe power output of motor 12, M
tbe the hydraulic torque of the working diaphragm 24 in motor 12, and n is the rotor speed of motor 12.
In addition, the hydraulic torque of the working diaphragm 24 in motor 12 is, the surface area of the hydraulic pressure of reducing agent supply pump 10, working diaphragm 24 and the eccentric throw of eccentric wheel 18 meet following equation (3).
M
t=P×A×2r （3）
Wherein, P is the hydraulic pressure of reducing agent supply pump 10, and A is the surface area of working diaphragm 24, and r is the eccentric throw of eccentric wheel 18.For given reducing agent supply pump 10, A and r are constants.
In addition, the operating efficiency of motor 12, input power and power output meet equation (4).
η=P
out/P
in （4）
Wherein, η is the operating efficiency of motor 12.
According to equation (1), (2), (3) and (4), can obtain the equation (5) for calculating the hydraulic pressure of reducing agent supply pump 10.
P=k×η×U ×I/n （5）
Wherein, k=15/ (A * r * π), for given reducing agent supply pump 10, k is constant.
Obviously, according to equation (5), only utilize the parameter of the motor 12 in reducing agent supply pump 10 just can calculate the hydraulic pressure of reducing agent supply pump 10, thereby do not need for measuring the pressure sensor of the hydraulic pressure of reducing agent supply pump 10, reduced the cost that Vehicular exhaust is processed.
In addition, inventor also finds through a large amount of experiments, the stator current of the temperature of motor 12 and motor 12 relation that is inversely proportional to.That is, along with the temperature rising of motor 12, the stator current of motor 12 diminishes, and along with the temperature reduction of motor 12, it is large that the stator current of motor 12 becomes.
In an embodiment of the present invention, operating efficiency for the required motor 12 of the hydraulic pressure of former dose of supply pump 10 of quick acquisition calculating, measure in advance the operating efficiency of the corresponding motor 12 of each input power of motor 12 at normal temperatures, and the mapping relations between the input power of the operating efficiency of measured motor 12 and corresponding motor 12 are pre-stored in DCU 30.In addition, measure in advance the stator current of motor 12 at each temperature, calculate the stator current of measured motor 12 at each temperature and the ratio of motor 12 stator current at normal temperatures, current correction coefficient as motor 12 at each temperature, and calculated current correction coefficient is pre-stored in DCU 30 with the mapping relations between corresponding temperature.
Fig. 2 shows according to the communication scheme of the urea-spray control unit of one embodiment of the invention and reducing agent supply pump.As shown in Figure 2, urea-spray control unit (DCU) 30 and reducing agent supply pump 10 only communicate by a data wire 40 with time division multiplexing mode work.
Particularly, be divided into the service time of data wire 40 a plurality of time slot T1, T2, T3 ... Tn.
Wherein, odd number time slot T1, T3, T5 ... being assigned to reducing agent supply pump 10 uses, so that reducing agent supply pump 10 sends the required parameter of hydraulic pressure of calculating reducing agent supply pump 10, that is: stator current, temperature and the rotor speed of the motor 12 in reducing agent supply pump 10 by data wire 40 to DCU 30 in distributed time slot.The required parameter of hydraulic pressure of calculating reducing agent supply pump 10 also comprises the stator voltage of motor 12, but the power supply of motor 12 offers motor 12 by DCU 30, so DCU 30 knows the stator voltage of motor 12, thereby DCU 30 need to not obtain from reducing agent supply pump 10 stator voltage of motor 12.
Wherein, even number time slot T2, T4, T6 ... being assigned to DCU 30 uses, so that DCU 30 sends the setting rotor speed of calculating in distributed time slot to reducing agent supply pump 10 by data wire 40, thereby reducing agent supply pump 10 can be controlled the rotor of motor 12 and rotates according to received setting rotor speed.
Fig. 3 shows according to the schematic flow sheet of the computational methods of one embodiment of the invention.The computational methods of the present embodiment are carried out by DCU 30.
As shown in Figure 3, at step S300, DCU 30 receives stator current, temperature and the rotor speed of motor 12 from reducing agent supply pump 10.
At step S304, DCU 30, from the temperature and the mapping relations between current correction coefficient of pre-stored motor 12, finds out the current correction coefficient shining upon mutually with the temperature of received motor 12.
At step S308, DCU 30 is used the stator voltage of the current correction coefficient searched, motor 12 and the stator current of the motor 12 that receives, according to following equation (6), carrys out calculating motor 12 equivalent input power at normal temperatures.
P
in-equivalent=U×I×λ （6）
Wherein, P
in-equivalentbe motor 12 equivalent input power at normal temperatures, U is the stator voltage of motor 12, and I is the stator current of received motor 12, and λ is searched current correction coefficient.
At step S312, DCU 30 is from the input power and the mapping relations between operating efficiency of pre-stored motor at normal temperatures 12, retrieve the operating efficiency of shining upon mutually with calculated motor 12 equivalent input power at normal temperatures, as the operating efficiency of motor 12.
At step S316, DCU 30 uses the operating efficiency of motor 12 retrieved, stator current and the rotor speed of the stator voltage of motor 12 and the motor 12 that receives, calculates the hydraulic pressure of reducing agent supply pump 10 according to equation (5).
At step S320, DCU 30 is according to the hydraulic pressure of calculated reducing agent supply pump 10, and passing ratio integral differential (PID) controls the setting spinner velocity of calculating motor 12.Because the calculating of step S320 is prior art, do not repeat them here.
After the setting spinner velocity of motor 12 is calculated, DCU 30 can send to reducing agent supply pump 10 by data wire 40 the setting spinner velocity of calculated motor 12, thereby reducing agent supply pump 10 can be controlled the rotor of motor 12 and rotates according to this setting rotor speed.
Other modification
Those skilled in the art are to be understood that, although in the above embodiments, odd number time slot T1, T3, T5 ... be assigned to that reducing agent supply pump 10 is used and even number time slot T2, T4, T6 ... be assigned to DCU 30 and use, yet the present invention is not limited thereto.In some other embodiment of the present invention, also can by odd number time slot T1, T3, T5 ... distribute to DCU 30 and use, and by even number time slot T2, T4, T6 ... distributing to reducing agent supply pump 10 uses.
Although it will be appreciated by those skilled in the art that in the above embodiments, DCU 30 and reducing agent supply pump 10 only communicate by a data lines 40, yet the present invention is not limited thereto.In some other embodiment of the present invention, also can DCU 30 and reducing agent supply pump 10 also can communicate by many data lines.For example, between DCU 30 and reducing agent supply pump 10, have a plurality of data wires, wherein, each data lines is used for transmitting one of them parameter.
Although it will be appreciated by those skilled in the art that in the above embodiments, for the treatment of the reducing agent of tail gas, be automobile-used urea, yet the present invention is not limited thereto.In some other embodiment of the present invention, reducing agent can be also some other raw material that is applicable to process tail gas.
Those skilled in the art are to be understood that, although in the above embodiments, utilize the temperature of pre-stored motor 12 and the mapping relations between current correction coefficient and the input power of motor 12 and the operating efficiency that the mapping relations between operating efficiency are obtained motor 12 at normal temperatures, yet the present invention is not limited thereto.In some other embodiment of the present invention, for example also can measure in advance the operating efficiency of the corresponding motor 12 of each input power of motor 12 under different temperatures, then that the temperature of the operating efficiency of measured motor and corresponding motor 12 and the mapping relations between input power is pre-stored in DCU 30.In this case, after obtaining temperature, stator voltage and the stator current of motor 12, DCU 30 is according to the input power of the stator voltage of obtained motor 12 and stator current calculating motor 12, then, DCU 30 is from the operating efficiency of pre-stored motor and the temperature of motor 12 and the mapping relations between input power, retrieve the operating efficiency of shining upon mutually with the input power of the temperature of obtained motor 12 and the motor 12 that calculates, as the operating efficiency of motor 12.
Fig. 4 shows according to the schematic diagram of the calculation element of one embodiment of the invention.Calculation element shown in Fig. 4 can be the parts that can be arranged on DCU 30, and in this case, this calculation element can utilize the mode of software, hardware or software and hardware combining to realize.Or it is own that the calculation element shown in Fig. 4 is exactly DCU 30.
As shown in Figure 4, calculation element 400 can comprise communication module 404, measurement module 408 and computing module 412.Wherein, communication module 404 is for from for obtaining temperature, stator current and the rotor speed of the motor 12 of pump 10 for the treatment of the pump 10 of the reducing agent of tail gas to vehicle supply.Measurement module 408, for according to the stator voltage of obtained temperature and stator current and motor 12, is determined the operating efficiency of motor 12.Computing module 412, for according to the stator voltage of determined operating efficiency, the stator current obtaining and rotor speed and motor 12, calculates the hydraulic pressure of pump 10.
In addition, measurement module 408 can comprise: for the mapping relations between the temperature from pre-stored motor 12 and current correction coefficient, search the module of the current correction coefficient shining upon mutually with obtained temperature; For according to searched current correction coefficient, described in the stator current that obtains and the stator voltage of motor 12, the module of calculating motor 12 equivalent input power at normal temperatures; And, for the input power of the motor at normal temperatures 12 from pre-stored and the mapping relations between operating efficiency, retrieve the operating efficiency of shining upon mutually with calculated equivalent input power, as the module of the operating efficiency of motor 12.
In addition, calculation element 400 can also comprise: control module 416, and for according to calculated hydraulic pressure, the setting spinner velocity of calculating motor 12.
These variants and modifications it will be appreciated by those skilled in the art that above disclosed each embodiment can partially not make various variants and modifications invention essence in the situation that, within all should fall within protection scope of the present invention.Protection scope of the present invention should be limited by the accompanying claims.
Claims (12)
1. computational methods, comprise step:
From for obtain temperature, stator current and the rotor speed of described pump motor for the treatment of the pump of the reducing agent of tail gas to vehicle supply;
According to the stator voltage of obtained temperature and stator current and described motor, determine the operating efficiency of described motor; And
According to the stator voltage of determined operating efficiency, the stator current obtaining and rotor speed and described motor, calculate the hydraulic pressure of described pump.
2. computational methods as claimed in claim 1, wherein, described determining step comprises:
From the temperature and the mapping relations between current correction coefficient of pre-stored described motor, search the current correction coefficient shining upon mutually with the described temperature of obtaining;
According to searched current correction coefficient, described in the stator current that obtains and the stator voltage of described motor, calculate described motor equivalent input power at normal temperatures; And
From the input power and the mapping relations between operating efficiency of pre-stored described motor at normal temperatures, retrieve the operating efficiency of shining upon mutually with calculated equivalent input power, as the operating efficiency of described motor.
3. computational methods as claimed in claim 1, wherein
According to following equation, calculate the hydraulic pressure of described pump:
P=k×η×U×I/n
Wherein, p is the hydraulic pressure of described pump, and η is the operating efficiency of described motor, and U is the stator voltage of described motor, and I is the stator current of obtained described motor, and n is the rotor speed of obtained described motor, and k is constant.
4. computational methods as claimed in claim 2, wherein
According to following equation, calculate described motor equivalent input power at normal temperatures:
P
in-equivalent=U×I×λ
Wherein, P
in-equivalentbe described motor equivalent input power at normal temperatures, U is the stator voltage of described motor, the stator current of the described motor that I obtains described in being, and, the current correction coefficient that λ searches described in being.
5. computational methods as claimed in claim 1, wherein
The temperature of described motor, stator current and rotor speed are to obtain from described pump by a data wire with time division multiplexing mode work.
6. as the computational methods as described in any one in claim 1-5, wherein, also comprise:
According to the hydraulic pressure of described calculating, calculate the setting spinner velocity of described motor.
7. a calculation element, comprising:
Communication module, for from for obtaining temperature, stator current and the rotor speed of described pump motor for the treatment of the pump of the reducing agent of tail gas to vehicle supply;
Measurement module, for according to the stator voltage of obtained temperature and stator current and described motor, determines the operating efficiency of described motor; And
Computing module, for according to the stator voltage of determined operating efficiency, the stator current obtaining and rotor speed and described motor, calculates the hydraulic pressure of described pump.
8. calculation element as claimed in claim 7, wherein, described measurement module comprises:
Be used for from the temperature of pre-stored described motor and the mapping relations between current correction coefficient, the module of searching the current correction coefficient shining upon mutually with the described temperature of obtaining;
For according to searched current correction coefficient, described in the stator current that obtains and the stator voltage of described motor, calculate the module of described motor equivalent input power at normal temperatures; And
For from the input power of pre-stored described motor at normal temperatures and the mapping relations between operating efficiency, retrieve the operating efficiency of shining upon mutually with calculated equivalent input power, as the module of the operating efficiency of described motor.
9. calculation element as claimed in claim 7, wherein
According to following equation, calculate the hydraulic pressure of described pump:
P=k×η×U×I/n
Wherein, p is the hydraulic pressure of described pump, and η is the operating efficiency of described motor, and U is the stator voltage of described motor, and I is the stator current of obtained described motor, and n is the rotor speed of obtained described motor, and k is constant.
10. calculation element as claimed in claim 8, wherein
According to following equation, calculate described motor equivalent input power at normal temperatures:
P
in-equivalent=U×I×λ
Wherein, P
in-equivalentbe described motor equivalent input power at normal temperatures, U is the stator voltage of described motor, the stator current of the described motor that I obtains described in being, and, the current correction coefficient that λ searches described in being.
11. calculation elements as claimed in claim 7, wherein
The temperature of described motor, stator current and rotor speed are to obtain from described pump by a data wire with time division multiplexing mode work.
12. as the calculation element as described in any one in claim 7-11, wherein, also comprises:
Control module, for according to the hydraulic pressure of described calculating, calculates the setting spinner velocity of described motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210203560.8A CN103516287B (en) | 2012-06-19 | 2012-06-19 | Computational methods and computing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210203560.8A CN103516287B (en) | 2012-06-19 | 2012-06-19 | Computational methods and computing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103516287A true CN103516287A (en) | 2014-01-15 |
| CN103516287B CN103516287B (en) | 2017-11-17 |
Family
ID=49898463
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210203560.8A Expired - Fee Related CN103516287B (en) | 2012-06-19 | 2012-06-19 | Computational methods and computing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107002645A (en) * | 2014-10-31 | 2017-08-01 | 大陆汽车有限公司 | For the apparatus and method for the operating pressure for detecting the fluid pump for motor vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2506792Y (en) * | 2001-10-25 | 2002-08-21 | 骐成科技股份有限公司 | Air compressor with electricity management controller |
| CN1464196A (en) * | 2002-06-24 | 2003-12-31 | 吕明德 | Compressor frequency-converting control device |
| EP1705378A2 (en) * | 2005-02-24 | 2006-09-27 | Aisin Seiki Kabushiki Kaisha | Electric pump with pressure control |
| CN101701873A (en) * | 2009-11-13 | 2010-05-05 | 武汉理工大学 | Automobile engine tail gas waste-heat and electricity converting stand test device and method for controlling same |
-
2012
- 2012-06-19 CN CN201210203560.8A patent/CN103516287B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2506792Y (en) * | 2001-10-25 | 2002-08-21 | 骐成科技股份有限公司 | Air compressor with electricity management controller |
| CN1464196A (en) * | 2002-06-24 | 2003-12-31 | 吕明德 | Compressor frequency-converting control device |
| EP1705378A2 (en) * | 2005-02-24 | 2006-09-27 | Aisin Seiki Kabushiki Kaisha | Electric pump with pressure control |
| CN101701873A (en) * | 2009-11-13 | 2010-05-05 | 武汉理工大学 | Automobile engine tail gas waste-heat and electricity converting stand test device and method for controlling same |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107002645A (en) * | 2014-10-31 | 2017-08-01 | 大陆汽车有限公司 | For the apparatus and method for the operating pressure for detecting the fluid pump for motor vehicle |
| CN107002645B (en) * | 2014-10-31 | 2021-09-14 | 大陆汽车有限公司 | Device and method for detecting an operating pressure of a fluid pump for a motor vehicle |
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| Publication number | Publication date |
|---|---|
| CN103516287B (en) | 2017-11-17 |
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Address after: 214028 Xinhua Road national hi tech Industrial Development Zone, Jiangsu, China, No. 17, No. Applicant after: BOSCH AUTOMOTIVE DIESEL SYSTEMS CO., LTD. Address before: 214028 Xinhua Road national hi tech Industrial Development Zone, Jiangsu, China, No. 17, No. Applicant before: Bosch Automotive Diesel Oil System Co., Ltd. |
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